Thomery had barely stepped inside the room, when the diamond broker, who was close behind, flung a long silk scarf round his neck, and, pushing his knee into his victim's back for a support, he attempted to give, with Herculean force, the famous stroke of Father Francis Vigozous; energetic, Thomery did not lose his presence of mind.... He knew that to resist such a pull by simple force was impossible.... Quickly he threw himself backwards, thus giving to the strangling pull and falling on top of the woman, who had played this dastardly trick on him. From his constricted throat came a hoarse "Ah!" like a death rattle.

As he was falling, for one flashing second, it seemed as though he were going to escape from the vise which was crushing in his throat... then, out of the shadow, there had appeared the fantastic vision of a man in a tight fitting sort of black jersey, which covered him from head to foot.... His face was concealed by a hooded mask....

This man had leapt out of the shadow.

He held a dagger in his hand.

Before Thomery had time to make a movement, the masked man had pierced his chest with a single stroke!... The sugar refiner was naught but a convulsive corpse.

"Ah, well!" declared the so-called diamond broker, who had got to his feet and was kicking Thomery's body aside. "Ah, well, he is a dead weight this fellow!... By Jove, master, I fancied he was going to crush me, and that I should have to let him free!... You did well to come to the rescue!"

The masked man remarked in an indifferent tone:

"It really does not matter in the slightest!... Tell me, does anyone suspect?"

"No one, master. He came like a sheep to the slaughter."

"Princess Danidoff?"